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Is there evidence of space surrounding the BB singularity?
At the BB did our universe include anything other than the singularity?
... It seems to me that this universe might have started out infinitely large or at least extremely large.
"at very high energy densities (approx uniform throughout space), quantum corrections can even make gravity repel".
Sorry to focus here on one small part of all that you said.
Anyhow, are you saying that these quantum corrections may have taken place at the start of the BB. (I hope I didn't miss your point here. I'm just an amateur.
I certainly agree that it could have. I love the subject and follow parts of the research literature, but don't speak with any authority.
The model says that there was a classical universe AFAWK like ours in its basic physics, that collapsed in a crunch and instead of a "singularity" when it reached an extremely high density like 1% of planck the quantum effects began being felt and slowed down the contraction, and at some point like 40% planck density it turned around and rebounded.
...
It is with great reluctance then that I disagree with you and by association I suppose most of the Cosmology community. I do not believe, on dynamic grounds and all that I see around me in Nature, that before the Big Bang there was necessarily a classical universe like ours in basic physics.
Marcus,
If you're not an authority on cosmology, WHO IS?
If you're not an authority on cosmology, WHO IS?
Carl Sagan said:"Arguments from authority carry little weight -- "authorities" have made mistakes in the past. They will do so again in the future. Perhaps a better way to say it is that in science there are no authorities; at most, there are experts."